APA引文

Ashok Singh. (2019). UPSC Civil services prelims: General studies-1. wiley.

Chicago Edition Citation

Ashok Singh. UPSC Civil Services Prelims: General Studies-1. New Delhi: wiley, 2019.

MLA引文

Ashok Singh. UPSC Civil Services Prelims: General Studies-1. wiley, 2019.

警告：這些引文格式不一定是100％准確.